One of the drive axles is split and will need replacing. This is a common problem and spares can be found at Peter's Spares.
BACHMANN 'OO' GAUGE 31-828 BR LINED BLACK 2-6-0 MOGUL CLASS 43XX 5370 LOCOMOTIVE
BACHMANN OO GAUGE 31-692 BR BLACK STANIER MOGUL CLASS '42968' STEAM LOCOMOTIVE
Dapol 4S-043-008, OO Gauge, Mogul Class 43xx, 2-6-0 Loco , 5322, ROD Khaki
