State Railway of Thailand (SRT) (Thai: การรถไฟแห่งประเทศไทย, RTGS: Kan Rotfai Haeng Prathet Thai) train no.1253 belongs to the so called NKF class of diesel multiple units. The NKF trains were built by the Japanese companies Nippon Sharyo, Hitachi, Fuji Heavy Industries, Kawasaki Heavy Industries, Niigata Tekkousho, and Kinki Sharyo in 1985. They were built in two series, 64 trains first and then 12 trains more. It is a 235 hp producing diesel multiple unit with a top speed of 105 km/h. it is a further development and very similra to the earlier class THN, built by Tokyu, Hitachi and Nippon Sharyo in 1983.
Picture from the station of Hua Hin 3.7.2005 by Ilkka Siissalo.

Another view of the same NKF train at the station of Hua Hin. It was just about to leave towards Bangkok and the driver is looking through the window if it is already OK to start.
Picture from the station of Hua Hin 3.7.2005 by Ilkka Siissalo.

Another class NKF train no.1233. The train's front looks a bit distorted, but that is just optics due to the old mobile phone used for taking a picture of a very fast moving train in a hurry. This train was serving the Rayong to Bangkok route as it passed by 1.1.2019 at 14.09 a railroad crossing by Chomtien Beach. Matti Tenkanen was there waiting and took for us this picture with his old Nokia handy. Note that on this SRT Eastern Line the same trains have a bit different livery than in the south.
Picture from the Toonklong-Talman Road railway crossing at Pattaya City 1.1.2019 by Matti Tenkanen.

When the train to Bangkok pictured above had left, it turned out that there was another diesel multiple unit parked at the station of Hua Hin. This diesel multiple unit no. 1116 belongs to the earlier mentioned so called THN class of trains built by Tokyu, Hitachi and Nippon Sharyo in 1983. 40 trains of this class were built. Just like the later NKF class, these also have a power rating of 235 hp and a maximum speed of 105 km/h.
Picture from the station of Hua Hin 3.7.2005 by Ilkka Siissalo.

Another view of the same THN class train no. 1116 but from the other end. The middle coach had extensive ugly graffiti smearings.
Picture from the station of Hua Hin 3.7.2005 by Ilkka Siissalo.

A sign by the side of the train 1116 said that this was a special tour train from Bangkok to Suansoan Pradipat, but for some reason the tour had here stopped at Hua Hin. Maybe this was a group of tourists looking at the sights of the famous touristic resort?
Picture from the station of Hua Hin 3.7.2005 by Ilkka Siissalo.

The station of Hua Hin is quite beautiful and dates back to the times of the old colonial Siam Railway. The Southern Line third phase between Cha-am Station to Hua Hin opened in November 1911. In 1967, Colonel Saeng Chulacharit (former minister of the State Railway of Thailand) coordinated the relocation of the Sanam Chandra Palace Railway Pavilion from Sanam Chandra Palace, to Hua Hin and it was renamed to "Phra Mongkut Klao Pavilion". That is the reason wh the station looks so fine in the old Siamese style.
Picture from the station of Hua Hin 3.7.2005 by Ilkka Siissalo.

There is an old locomotive of the Baldwin type, no. 305 set up as a monument at the Hua Hin station. The machine has been built at SLM in Winterthur in Switzerland.
Picture from the station of Hua Hin 3.7.2005 by Ilkka Siissalo.

A closer look at the same old steam engine.
Picture from the station of Hua Hin 3.7.2005 by Ilkka Siissalo.

The Thai state railways railbus 1229 on the right is a modernised class NKF Japanese railbus from 1985, built by the companies Nippon Sharyo, Hitachi, Fuji Heavy Industries,Kawasaki Heavy Industries, Niigata Tekkousho, and Kinki Sharyo. It's very similar to the class THN railbuses pictured above, but has less comfortable plastic chairs as it is intended only for short haul traffic. On the left long distance night train coaches.
Picture from Bangkok Hua Lamphong station 15.5.2018 by Markku Salo.

This old diesel locomotive in front of a long distance night train is of the type UM12C made by General Electric in 1966. It is a 1320 horsepower machine with a top speed of 103 km/h. They were refurbished 2010-2011. This no. 4041 was the first one of a second series of these locomotives. The first ones were from 1963.
Picture from Bangkok Hua Lamphong station 15.5.2018 by Markku Salo.

Same machine, different day. The Thai Railways 4041 is a constant sight at Bangkok Hua Lamphong station.
Picture from Bangkok Hua Lamphong station 7.6.2018 by Markku Salo.

Believe it or not, this is one of the same locomotives as in the picture above, in fact the next one in series from 1966. It has just received a new painting and therefore looks like new.
Picture from Bangkok Hua Lamphong station 15.5.2018 by Markku Salo.

Yet another General Electric UM12C locomotive leading a night train. This machine is from the first series of 1963.
Picture from Bangkok Hua Lamphong station 7.6.2018 by Markku Salo.

Another General Electric UM12C locomotive approaching the town of Pattaya. Judging by the serial number, this locomotive dates back to 1963 and has been thoroughly rebuilt and refitted with a new engine in 2010-11.
Picture by the Lieb Tang Rodfai Road in Pattaya 18.8.2023 by Matti Tenkanen.

These were the coaches that the locomotive shown above was hauling. They are recently modernised long distance train coaches. This train had 10 coaches. In Europe it is customary to mark the first class coaches with a yellow band on top of the windows and coaches without the yellow band are of the 2nd class. However in Thailand, even these 3rd class coaches have a similar yellow band.
Picture by the Lieb Tang Rodfai Road in Pattaya 18.8.2023 by Matti Tenkanen.

A view from the depot of the station Chiang Mai. From the left: The railbus on the left belongs to the class ASR. It is the same train which in the UK is called class 158 and it has been built by British Rail Engineering Ltd Derby works in 1991. These railbuses can run 160 km/h, but the Thai ministry has only allowed speeds up to 120 km/h. The other railbus to the right of it belongs to the class NKF built by a consortium of Japanese companies. Those trains are pictured here already above. Then there are two large diesel locomotives on the right of the picture. Of those, the one on the left is yet again one of the class UM12C machines of General Electric, pictured in pictures above. The large locomotive on the right with the yellow front, no.4201 is the first individual of a series of 30 locomotives from the year 1980 built by Alsthom, Henschel and Krupp. It is a 2400 horsepower machine with a top speed of 100 km/h.
Picture from Chiang Mai 17.5.2018 by Markku Salo.

Again one of the General Electric UM12C locomotives. This is from the first batch of 1963. These were refurbished 2010-2011. Thai railways had originally 50 of them from two batches.
Picture from Chiang Mai 17.5.2018 by Markku Salo.

This locomotive no.4112 belongs to the first batch of AD24C locomotives delivered to Thailand 1974-75. These were made by Alsthom in France. It is a 2400 horsepower strong and 90 km/h fast locomotive. 54 were delivered in this first batch. Note the blue stripe at its side. This tells us that this locomotive is from the very first batch which has a Pielstick engine.
Picture from Bangkok Hua Lamphong station 7.6.2018 by Markku Salo.

Locomotive no.4408 is one of the same Alstom locomotives as the one shown above, but this one is from the very latest batch, which has a modern Caterpillar engine. In Thailand internally these are called ADD locomotives. This latest batch consisted of 20 locomotives, built in France in 1985. Like the older ones, it's rated at 2400 horsepowers and has a top speed of 100 km/h. Here we see the train coming from the south, from Rayong, and heading north towards Pattaya City along the railroad main line which lies close to the seaside at Pattaya.
Picture from a road crossing near Sinthara Village, Pattaya, 21.8.2022 by Matti Tenkanen.

This is the same train as shown above, a regional train with only 3rd class coaches running towards Pattaya City.
Picture from Sinthara Village, Pattaya, 21.8.2022 by Matti Tenkanen.

Night train coaches.
Picture from Bangkok Hua Lamphong station 7.6.2018 by Markku Salo.

Third class passenger and luggage coaches.
Picture from Bangkok Hua Lamphong station 7.6.2018 by Markku Salo.

Thai state railways locomotive 4533 is a CM22-7i machine of General Electric Corporation from 1995-96. Thai railways got 38 of them. It is a 2500 horsepower and 100 km/h machine. They were purchased as part of the Thai state's Main Line Locomotive Program. They have Cummins KTA-50L engines.
Picture from Bangkok Hua Lamphong station 7.6.2018 by Markku Salo.