Mark Williams On The Rails

I reseived this double DVD for my 75th Birthday.
An excellent series of programmes which I relly enjoyed.
However, having travelled several times on the Rio Grande narrow Guage Railways i.e Durago to Silverton, Cumbres and Toltec and Georgetown Loop, I would like to point out that the track guage used on these railways is THREE feet and not TWO as stated in the programmes