in the side of the troop compartment. Because of the engine placement (in the rear of the vehicle), transported infantry must mount and dismount through the sides in the BTR-60P or through the roof hatches in the roofed BTR-60PA, BTR-60PB, and BTR-60PZ variants. To help the infantry to mount and dismount the vehicle, the BTR-60P had two steps on each side of the hull, one between the first and second pair of road wheels and the other between the third and fourth pair of wheels. It also had two vertical hand rails on each side of the troop compartment, as well as an angled horizontal one on the left-hand side of the hull next to the engine compartment. The BTR-60PA introduced yet another step on each side of the hull between the second and third pair of wheels, as well as six horizontal hand rails on each side of the vehicle, three on the lower side and three on the upper side. The vertical ones were removed, while yet another angled horizontal one was added on the right-hand side of the hull next to the engine compartment. In the BTR-60PB, the number of hand rails decreased from six to five on each side of the hull; the rear upper hand rail was removed from the right side, whereas the center upper one was removed from the left side. The BTR-60P has two doors on each side of the troop compartment (one in the front and one in the rear), but infantry still had to dismount through the sides. The side doors were removed in the BTR-60PA. They were used mostly as emergency exits and as auxiliary firing ports. In the BTR-60PB, a side door was added on the front left of the troop compartment. Protection The hull armour is made from welded steel and provides protection against small arms fire and shrapnel. The frontal armour can withstand 7.62 mm bullets from any range. The rest of the armour can withstand 7.62 mm bullets from a range of 100 m. The BTR-60P did not have a roof over the troop compartment, which made a weakness that could easily be exploited—even the simplest explosives could take out a BTR-60P. The new BTR design with a roof was called the BTR-60PA. Armour thickness is as follows: Maneuverability The BTR-60 has a 8x8 suspension. Originally, there were difficulties in finding a suitable engine for