What the title says. Only some are missing bogies. The specific wagons missing bogies are:
From the main Railways mod: 4ACW KR-Special, 4A-Tank-WATER, 4A-Tank-ACID, 4AFW KR-Special, 4A-Tank-OIL, and Thunder Skys locomotive.
From the Railroads add-on: 4A Cargo Wagon - Chests, 4A Cargo Wagon - Stuff, F7 Cargo Wagon, both Open Cargo Transports, Gears Transport, Closed Cargo Transport, Stone Brick Transport, and Red Brick Transport.
From the Uranium Power Trains add-on: V-Uran-Transport, and V-Element-Transport.
I really love these mods (I use them on pretty much every modded save) so I hope this can be easily resolved.