As early as 1900 - 1901, the Vidzeme Branch Line Company purchased 14 modern, powerful Russian-built "A" class 0-8-0 steam tender locomotives (type 65) as motive power for the new narrow-gauge railway. They were numbered 1 - 14.
As late as the end of World War 1, there were no significant changes in the locomotive fleet. During the liberation struggle, some rolling stock was used in the formation of armoured trains, and the remainder moved to Valka and declared spoils of war.
On May 1st., 1919, when rolling stock was registered in Latvia for the first time after the war, 30 750mm narrow-gauge locomotives were registered. Less than one year later, on February 1st., 1920, only 13 locomotives of this gauge remained in the stock lists of the Latvian State Railways. Moreover, 10 of these were small, low-powered 0-4-0 Mp and 0-6-0 "Tp" class locomotives. In 1921, in order to, at least, slightly improve the situation, the Latvian Central Railway Administration bought two powerful 0-10-0 "Sp" class tender locomotives from Estonia. These had been built in 1914 by Orenstein & Koppel in Germany and had been used at the Revel sea fortress.
In order to address the problem of the shortage of narrow-gauge locomotives in Vidzeme, modern "Rp" class tender locomotives were ordered in the early 1920s from Linke Hofmann in Germany. These were the most modern and economic steam locomotives in Europe for narrow-gauge branch line use. This class was used on Latvian branch line railways, including the Gulbene - Valka line, for more than 30 years. A significant addition was the 5 Pp class locomotives received in 1924, pursuant to the Latvian - Russian peace treaty. They were built in the Kolumna factory, and were similar in construction to the first 14 locomotives used by the Vidzeme Branch Line Company.
Thus, by the mid 1920s, there were 10 functional "Sp", "Pp" and "Rp" steam locomotives at the disposal of the Gulbene - Aluksne - Ape - Valka - Rujiena railway. Later on, until the beginning of World War 11, they were used on various narrow-gauge railways in Latvia.
The war brought major changes to the locomotive fleet, as most of the Latvian Railways locomotives were destroyed or taken out of the country by the end of the war. During the immediate post-war years, Gulbene depot used some of the remaining "Rp" class, as well as "Pp" class locomotives assembled from parts of locomotives blown up by the Germans in Puikule. Only from 1950 onwards were these outdated locomotives replaced by "Gr" class steam locomotives built in the K. Marx factory (formerly Orenstein & Koppel) in Babelsberg, Germany. The future of the Latvian narrow-gauge network now lay with the mid - 1950s programme for the cultivation of virgin lands in the USSR.

A series

Tp series

Mp series

Rp series

Sp series

Gr series