Meall a' Chaorainn
Meall a' Chaorainn is a Marilyn, 705m high, and also counts as a HuMP. The Marilyns are hills anywhere in Britain and Ireland with at least 150 metres of prominence, whatever their height.
Achnasheen is the nearest station, 2.1 mi (about 3 to 3.5 mi on foot), so the summit is within walking distance of the train. From Achnasheen it's about 2 hours to the summit, 1 in 6 on average. Achanalt, 7.7 mi (about 11 to 12.5 mi on foot), is the only other station within 10 miles. Fionn Bheinn is the only other listed hill within 2 miles.
Stations within 10 miles of Meall a' Chaorainn, nearest first. Walking distances are estimates from the straight-line distance and the type of ground, not a measured route. Check a map before you set off. Times use Naismith's rule and don't include stops.