English: occupation crossing 
Welsh: croesfan wasanaethu
Subject: Trafnidiaeth
Welsh definition: An occupation crossing enables a dweller (usually, but not always a farmer) to reach his living premises where the only access was by a road/track now 'severed' by a railway. Occupation crossings serve dwellings and are in constant use.
Plural: croesfannau gwasanaethu
Notes: Mae'r cysyniad hwn yn debyg iawn i gysyniad yr accommodation bridge / pont wasanaethu