I could be wrong with this statistics from wikipedia but,
R62A - Width: 8.60 feet (2,621 mm) Height: 11.89 feet (3,624 mm) Platfrom height: 3.65 ft (1.11 m)
R142A - Width: 8.60 feet (2,621 mm) Height: 11.89 feet (3,624 mm) Platfrom height: 3.6458 ft (1.11 m)
So either is you or is probably the few inch door difference between the rolling stock.