What is British Rail Class 57?
{{Infobox Locomotive |name = British Rail Class 57 |powertype = Diesel-electric |image = 57012 'Freightliner Envoy' at Ipswich.JPG |caption = Class 57, no. 57012 ''Freightliner Envoy'' at [[Ipswich]] on [[31 January]] [[2004]] |roadnumber = 57001–57012, 57301–57316 57601–57605 |builder = [[Brush Traction]] or [[Crewe Works|BR Crewe Works]];<br/ >Rebuilt by Brush Traction |totalproduction = 33 |whytetype = Co-Co |uicclass = Co'Co' |gauge = {{RailGauge|sg|al=on|lk=on}} |length = {{convert|19.38|m|ftin}} |width = {{convert|2.79|m|ftin}} |locoweight = ''57/0 & 57601:'' {{convert|120.6|t|sigfig=3|lk=on}}<br />''57/3 & 57602–57605:'' {{convert|117|t|sigfig=3}} |topspeed = ''57/0:'' {{convert|75|mph|0|abbr=on}}<br />''57/3 & 57/6:'' {{convert|95|mph|0|abbr=on}} |builddate = Rebuilt: 1997–2004 |primemover = ''57/0:'' [[Electro-Motive Diesel|EMD]] 645-E3<br/ >''57/3 & 57/6:'' EMD 645-F3B |enginetype = [[V12]] [[two-stroke]] diesel |poweroutput = ''57/0:'' {{convert|2500|bhp|sigfig=3|abbr=on|lk=on}}<br />''57/3 & 57/6:'' {{convert|2750|bhp|sigfig=3|abbr=on}} |trainbrakes = Air |locobrakeforce = ''57/0:'' {{convert|80|LTf|kN|sigfig=3|abbr=on|lk=on}}<br/ >''57/3 & 57/6:'' {{convert|60|LTf|kN|sigfig=3|abbr=on}} |fuelcap = ''57/0:'' {{convert|5550|l|abbr=on|lk=on}}<br />''57/3 & 57/6:'' {{convert|5887|l|abbr=on|lk=on}} |trainheating = ''57/0:'' None<br>''57601:'' [[Head end power|Electric Train Supply]] index 95<br>''57/3 & 57602–57605:'' Electric Train Supply index 100 |railroad = [[Freightliner (UK)|Freightliner]]<br>[[Virgin Trains]]<br>[[First Great Western]]<br>[[Cotswold Rail]]<br>[[Direct Rail Services]]<br>[[West Coast Railway Company|WCRC]] }} [[Image:57601 near Cheltenham.jpg|thumb|right|Class 57/6, no. 57601 passing [[Brockhampton, Gloucestershire|Brockhampton]], north of [[Cheltenham]], on [[16 April]] [[2005]], whilst working a [[Bath, Somerset|Bath]]–[[Skegness]] charter train. This locomotive was the prototype passenger Class 57, and is now operated by the [[West Coast Railway Company]].]] The '''[[British Ra