Another 'vote' for the Malvern Hills from the Warwickshire judge.
Do a Google image search, Twigs, and look at the outline. It should be familiar (couple of photos below).
The ridge runs north-south (so parallel to your train's direction of travel) and rises impressively from the plain of the Severn Valley south of Worcester. The highest point is little over 1,300 feet and the hills are smooth and, mostly, grass-covered above the tree line - but they certainly look more 'mountainous' than they are.
If you fancy a closer acquaintance with them thar hills, join the OM Malverns day walk on 9 September (see Meets thread).