Type 1:USFB
Fabricator: Allslade
Engineer: Whitby Bird
Span: 9.2 Metres
Beam: USFBs typically 320-340mm deep.
Description: The USFBs were designed to carry PC Units and span upto 9.2m.
The longer span beams were pre-cambered at no cost upto 27mm for dead-load deflection.