As for railways, Manchukuo is at the very least crossed by the South Manchurian and Trans-Manchurian Railways, which both branch throughout the country. The former links Hsinking and Harbin with the Kwantung Territory and points farther south, whereas the Trans-Manchurian links Harbin with Chita and Khabarovsk in the USSR and Kalgan, Mengjiang. Both have many branches into the interior, but the Japanese and Manchurians are outnumbered by the Soviets. Roads can be built fairly easily too, but both take time. The Soviets greatly outnumber the Japanese and Manchurian forces, especially in quantity and quality of armour. In terms of artillery, both have good quality guns and gunners, but the Soviets have more; and in terms of airpower, the IJAAS holds an advantage in quality but not quantity.
The IJA, and even the IJN have expertise with railway troops. The IJA has a few armoured trains, as well as railway repair battalions., and one Schneider-built railway gun. The IJN has several railway guns- in addition to those made with the 14" L/45 guns taken off the Fusos and Ises when they were converted to carriers, there is HIJM Gun Jimmu. Jimmu was made from a Vickers design for a 14"/L50 gun for Russian export for the would-be Izmail/Borodino class battlecruisers. It fired a heavier shell than the older 14"/L45 (about 1650 vs 1485 pounds per shell), originally at lower velocity. The IJN briefly considered refitting the Kongos with these bigger guns, but Vickers considered them structurally weak, and unacceptably prone to cracking. The IJN ordered a Japanese-made strengthened version based on the Vickers pattern, which could now fire the same heavy shell at higher velocity (2650-2700fps), but the gun was now too large and heavy to replace the Kongos' guns without significant modifications, which simply wouldn't be worth it. Instead, one of the two guns was put on a railway mount and the other kept as a spare.