. ▁ ▁A ▁p ony ▁tr uck ▁required ▁a ▁h itch ▁to ▁attach ▁horses . ▁ ▁The ▁term , ▁when ▁applied ▁to ▁US ▁steam ▁locomot ives ▁after ▁ 1 9 0 0 , ▁is ▁considered ▁arch a ic . ▁P ony ▁tr uck s ▁are ▁not ▁quite ▁analog ous ▁to ▁an ▁art ic ulated ▁locomot ive . ▁ ▁The ▁p ony ▁tr uck ▁can ▁move ▁radial ly ▁around ▁a ▁real ▁or ▁virtual ▁pivot . ▁When ▁the ▁pivot ▁is ▁situated ▁at ▁a ▁point ▁inside ▁the ▁tr uck , ▁the ▁tr uck ▁is ▁called ▁a ▁bog ie . ▁What ▁makes ▁it ▁a ▁B iss el ▁bog ie ▁is ▁the ▁pivot ▁being ▁placed ▁outside ▁to ▁the ▁rear ▁or ▁fore . ▁▁ ▁Ex amples ▁ ▁Ex amples ▁of ▁steam ▁engines ▁fitted ▁with ▁B iss ell ▁tr uck s ▁include ▁the ▁German ▁DR G ▁Class ▁ 6 4 ▁and ▁Class ▁ 9 9 . 7 3 - 7 6 ▁locomot ives . ▁Some ▁older ▁electric ▁locomot ives ▁have ▁B iss ell ▁tr uck s , ▁if ▁the ▁driving ▁ax les ▁are ▁located ▁in ▁the ▁main ▁frame ▁rather ▁than ▁the ▁now ▁usual ▁bog ies . ▁ ▁A ▁British ▁example ▁was ▁the ▁London ▁and ▁North ▁Western ▁Railway ▁ 0 - 4 - 2 ▁tank ▁locomot ive ▁which ▁was ▁known ▁as ▁a ▁" B iss ell ▁tank " ▁or ▁" B iss ell ▁tr uck ▁tank ". ▁It ▁was ▁also ▁used ▁on ▁the ▁South ▁African ▁Class ▁ 4 E ▁electric ▁and ▁Class ▁ 3 2 - 0 0 0 ▁and ▁