"Part of the train was a huge garage holding several automobiles and a gasoline tank. This made it possible for us to travel away from the railway line for several hundred versts. A squad of picked sharpshooters and machine-gunners, amounting to from twenty to thirty men, occupied the trucks and light cars. A couple of hand machine-guns had also been placed in my car. A war of movement is full of surprises. On the steppes, we always ran the risk of running into some Cossack band. Automobiles with machine-guns insured one against this, at least when the steppe had not been transformed into a sea of mud."
"The train was continually being reorganized and improved upon, and extended in its functions. As early as 1918, it had already become a flying apparatus of administration. Its sections included a secretariat, a printing-press, a telegraph station, a radio station, an electric-power station, a library, a garage, and a bath."
"All the crew could handle arms. They all wore leather uniforms, which always make men look heavily imposing. On the left arm, just below the shoulder, each wore a large metal badge, carefully cast at the mint, which had acquired great popularity in the army."
Leon Trotsky: My Life, chap. 34 "The train".
https://www.marxists.org/archive/trotsky/1930/mylife/ch34.htm