Inside diameter 2.4m. BWH Well wagon (20.47m long, 22.9t axle load) with 3-axled bogies. These are used for loads like heavy transformers, etc., up to 92t. BWL, BWS, BWH, BWT, BWX Different kinds of well wagons (tall wagons with inward sloping sides) BWZ Heavy-duty well wagon, for loads up to 220t such asPerfect transformers and power plant