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The Polish military in the first half of the 20th Century cultivated a rich armored train (Pociag Pancerny) tradition that started in early 1918 with Polish units formerly serving in the Russian Army and newly independent.

This early train, Związek Broni (Arms Association), was created at the Bobruisk (Babrujsk) fortress using captured Russian rolling stock and armed with a combination of Pulitov 76.2mm M1902 field guns and Maxim machine guns. At the same time, a flatcar carried a damaged Austin armored car.

With 90 armored locomotives constructed by the Poles, this was later expanded to over 40 named war trains in the 1919-21 period of combat against the Reds, Balts, and Ukrainians in the East and German Freikorps types in the West.

Once the wars were over, the better trains were retained and, eventually, modernized.

Just in case.

By September 1939, the Poles had at least a baker’s dozen war trains in their arsenal, each typically supported by a dedicated supply train that included sleeping and coal cars, repair workshops, and flatbeds carrying light tanks. The allowance for a full crew of an armored train (with its support train) in 1939 consisted of 8 officers, 59 non-commissioned officers, and 124 riflemen, with most cross-trained in repair and maintenance tasks.

Then, in Britain…

With this tradition behind them, it was logical for the Free Poles evacuated to Britain from France and elsewhere post-Dunkirk to man some armored trains. After all, there was a cadre of men among them familiar with their operation.

Starting in July 1940, troops of the 1st Polish Corps soon manned a series of 12 armored trains, organized into four dedicated battalions. The idea was that these trains could race up and down the coastline and form a mobile reserve in the event of German amphibious landings, or shuttle inland to tackle paratrooper insertions.

Produced in the Derby Carriage and Wagon Works and by the LNER works at Stratford in London, the trains were dubbed A, B, C, D, E, F, G, H, J, K, L, and M. While these varied in length, construction, and armament, they were usually much shorter than the type the Poles had operated 1918-1939, typically of just 4-5 cars with an engine in the middle.

A few images exist in the IWM with good detail.

As noted by one publication,

Armoured train K, powered by a single locomotive, No 7573, was armed with two 6-pounder guns, as well as six Bren machine guns, two Vickers machine guns, four Thompson sub-machine guns (Tommy guns) and numerous rifles carried by the crew. Initially, the train carried some 14,000 rounds of ammunition, which was later increased to some 38,000 rounds of varying calibers.

By 1942, with the chance of invasion of the British Isles slipping away and the Poles better used in North Africa, they left their trains behind for Home Guard use and pulled stumps for warmer, and more German-rich, climes.

As detailed by Brian Osborne’s The People’s Army:

In their Home Guard role, the trains were each initially armed with two Hotchkiss 6-pounder cannon, a Vickers machine-gun, and four Bren guns. They were manned by 16 Home Guardsmen under a captain, with a lieutenant as weapons training officer, two signalers, and a train crew of four. In addition, there was a mobile base consisting of a passenger coach and brake van to provide crew transport and catering. This came under the charge of the second in command, along with a company sergeant major, a train crew of three, and a fighting crew of six deploying two Bren guns and a Boys anti-tank rifle – an armorer and a further three men, making a total in the mobile base of 14. Thus, each armored train had a total complement of 38 officers and men. The mobile base would be detached from the train when going into action.

However, after the war, the Poles continued to use armored trains into 1952 when the Dywizjon Artylerii Kolejowej (Railway Artillery Division) was finally disbanded and its inherited German and Soviet trains placed in reserve, capping a winding 34-year run.