Railway
Opened in 1906, the railway features prominently in the village.
The bridge was constructed in 1904 and the line opened on 2nd April 1906. This photo shows the newly constructed bridge:

Station
Adjacent to the bridge was Ilmer Halt, an on-request station where a telephone was used to ask for the next train to stop at the halt. The station was opened 1st April 1929 serving the London and North-Eastern Railway Company. Initially, 1 northboard and 1 southbound train stopped here every morning on weekdays. Ilmer Halt can be seen in this still image taken from a train cab video in 1962. The station closed the following year:

The station was evidently rarely used, as shown in the Parish Council minutes of 1934:
The Clerk was asked to place on the agenda for next meeting, the provision of a Shelter at Ilmer Railway Halt Longwick-cum-Ilmer Parish Council, Monday April 16th 1934
subsequently:
As it was reported that the Passengers travelling from Ilmer Halt only averaged two a week, the Council were of an opinion no good purpose would be served at present by making application to the Railway Co for the provision of a Shelter at the Halt. Longwick-cum-Ilmer Parish Council, Monday July 9th 1934