Fulbourn Railway
Traffic on the Fulbourn railway
The "route allocation" number for a line indicated which locomotives could travel on which lines, the higher the number then the heavier the locomotive.
In 1948 the British Rail route allocation map showed that the Fulbourn line was RA 8, which was quite high - even the mainline from London to Cambridge was only a 7+. Further along the line at Haughley (and onto Ipswich) it was also a 7+.