The tyres of the terrorists Mercedes squeal but they are on snow.
During the avalanche scene, the train driver is seen attempting to accelerate the train out danger. However the speedometer is reading zero.
Painfully obvious miniature train sets used. Avalance sequence contains same areas repeated, but shot from a slightly different angle - to expand the length of the overly-long avalanche scene.
When the train is in Italy and Switzerland, it is wintertime there, but when the train gets to the Netherlands all the trees have green leaves as if it is late spring or summertime.