The West Highland Line will be closed next month for upgrades.
Network Rail engineers will be carrying out refurbishment works on bridges and renewing the under-track drainage systems.
It will be closed between Crianlarich and Fort William from October 5-14.
Bridges near Spean Bridge and Corrour will be refurbished and repainted, while the Auch (Horseshoe) Viaduct near Bridge of Orchy will have its timber deck renewed and its metalwork repaired and repainted.
Drainage culverts beneath the track between Tyndrum Upper and Bridge of Orchy will also be upgraded.
Due to the complexity and volume of the engineering work and the heavy machinery involved, these upgrades cannot be delivered without the closure of the line.
A bus replacement service will be running between Crainlarich and Fort William and will call at the majority of stations along the route apart from Corrour and Rannoch.
Lindsay Saddler, head of maintenance for Network Rail Scotland, said: “We need to carry out vital works at several points on the West Highland Line during this time.
“One of these jobs will be refurbishing the Auch Viaduct which involves lifting the track so we can replace the wooden deck underneath. The metalwork on the structure will also be repaired and repainted.
“Elsewhere, we’ll be renewing and rebuilding drainage culverts under the line, which given the recent weather, is an important task.
“These are significant and complex pieces of work and it is simply not possible to complete them without closing the line for a short time.
“We understand the inconvenience engineering works can cause to some customers and always try to deliver significant projects like these outwith the peak tourist seasons. We do though apologise to anyone whose plans are impacted by this closure.”