The Daffodil Line (or the Ledbury and Gloucester Railway, to give it its more formal name) was a railway line which ran between Ledbury, in Herefordshire, and Gloucester, in Gloucestershire, between 1885 and 1964.
The majority of the line was built over the southern section of the Herefordshire and Gloucestershire canal, which had opened in 1798 - it struggled, and was leased to the Great Western Railway who started converting it into a railway in 1881.
The railway was built by the Newent Railway and the Ross and Ledbury Railway, and opened on 27th July 1885 - it took passenger traffic until 1959, and goods traffic (on the Dymock to Gloucester section) until its closure in 1964.
The Snowdonia scenario takes its inspiration from the daffodils which the area was famous for, and livens up proceedings by requiring players to fill in the route of the canal prior to building track, and adding in daffodil collection and stone breaking to the mix of proceedings.
This scenario (the rules for which can be found here) is limited to four players at most as the yellow player's cubes are used to represent the daffodils.