The rules state
Rules Page 10 wrote:
The Hunter catches an express train
and may move up to three cities
away by Rail. These cities must be connected
by Rail routes. However, if any part of his
journey uses one of the rail routes in Eastern
Europe, then the Hunter may only move up
to two cities by Rail, like a Fast Train.
so in each of these 2 cases the move could only be 2 cities, there is also an example of the first case you quote on page 10 of the rules.
Rules Example wrote:
Van Helsing is in Nuremburg and
rolls a 2/3 when catching a train.
He could move to Hamburg by way
of Leipzig and Berlin if he wanted,
since the rail routes used are all fast
rails. However, he could not move
to Prague, since using the slow
Eastern European rail from Berlin
to Prague would reduce his movement
to 2 cities.