Task: Question Understanding
Input (English): Context : The South Eastern and Chatham Railway Companies Joint Management Committee (SE&CRCJMC), known as the South Eastern and Chatham Railway (SE&CR), was a working union of two neighbouring rival railways, the South Eastern Railway (SER) and London, Chatham and Dover Railway (LC&DR), which operated between London and south-east England. 
Question : What year was the service entry date for South Eastern and Chatham Railway?
Output (English): service entry