Kolenspoor, Former heritage railway in Genk and Maasmechelen, Belgium.

The Kolenspoor was a tourist railway between Waterschei and Eisden, running on parts of former lines 21A (Waterschei–As) and 21B (As–Eisden). It used old railway rolling stock. Two coupled passenger cars remain on the overgrown track: a dark green car with a black roof and a grey-green car with a dark lower band and a pale panel bearing a black "2".

The Kolenspoor was a tourist railway running from Waterschei through As to Eisden, using parts of the former lines 21A (Waterschei–As) and 21B (As–Eisden). Old rolling stock carried passengers until the track condition made the run to Eisden impossible. From July 2009 rail bikes ran between As and Eisden, later moved to line 20 in Munsterbilzen. Tourist operations stopped in 2014, and in 2015 the vzw Kolenspoor lost its concession for the whole Waterschei–As–Eisden section.

The line ran on the former routes of railway 21A between Waterschei and As and 21B between As and Eisden, built for the Limburg coal mines. From July 2009 visitors could also ride rail bikes between As and Eisden stations, before these moved to line 20 in Munsterbilzen. The two coupled carriages now standing in the grass recall the tourist trains that once ran here.

The line runs from Waterschei through As to Eisden on the former routes of lines 21A and 21B. Since 2014 tourist trains no longer run, and since 2015 the vzw Kolenspoor has lost its concession for the whole section; the rails are in poor condition, so the track is not a maintained cycling or walking path.

The heritage line ran on the former routes of railway lines 21A (Waterschei–As) and 21B (As–Eisden). From July 2009, rail bikes also ran between As and Eisden stations, later moved to line 20 in Munsterbilzen. The track's poor condition ended train service.