New designs have been developed:

• end walls and covers of unloading hatches of gondola cars, folding sides of platforms (Patents BY 1786 U, BY2091 U, BY 2358 U, BY 3566 U);
• drain devices for the lower discharge of liquid cargo from the boilers of tank cars (Patents BY 2615 U, BY 2970 U, BY 3286 U);
• fixing the boiler of the tank car to the frame (Patents BY 981 U, BY 3011 U, BY 4008 U).