The May 2007 issue of French magazine Rail Passion (issue no.115, page 86) has a one-page article by Dimitri Beck about the plinthed steam locomotive at Kabul museum.
“Une vapeur Henschel devant le musée de Kaboul” has two photos, including a rather nice view showing German NATO soldiers putting one of the locos on a four-axle military lorry; moving the loco 200m to the museum for safe-keeping took about 3 hours.
There is a mention of Wim Brummelman, who sent me some photos of the three locomotives in the past.
Thanks to Thomas Kautzor for alerting me to it.