The original section of the Whitby & Pickering from Grosmont to Moorgate, just shy of the summit.Whilst the track-bed continues to link up towards the summit where the two lined rejoin I don't think its part of the path. Likewise at Grosmont the path leaves the track-bed just shy of Grosmont and goes over the hill/tunnel into Grosmont. Many folk get the train to Goathland and walk down the bank, not forgetting to call at the Pub at Beckhole in order to top up the tanks
. Especially if your doing it that hard way going up the bank from Grosmont to Goathland
! It's far easier doing the downhill walk from Goathland. This line closed in the mid Victorian era not long after the W & P had been bought out by the York & North Midland. It had become something of a bottleneck to the service and there'd been a couple of accidents with the rope haulage arrangements over the years.........
Both this line and the "Deviation" run on opposite sides of the valley, with of course the Deviation being part of the North Yorkshire Moors.