the Caterham line runs between Caterham & Purley with stations across Surrey the stations the line calls at Caterham, Whyteleafe South, Whyteleafe, Kenley & Purley the line is managed by Network Rail & the stations are owned by Southern Rail GTR the trains used on the line the class 377 & class 455 the signalling is controlled by Three Bridges signalling Centre
This would be too short on it's own (6 miles), perhaps as part of a wider route such as this, the Tattenham Corner Branch and the Redhill to Tonbridge branch, terminating at Victoria.