EM was originally defined to use 18mm as the track gauge (hence the name), this was revised, and today EM gauge uses an 18.2mm track gauge, which is closer to accurate but not fully to scale.
EM was originally defined to use 18mm as the track gauge (hence the name: Eighteen Millimetres). This was revised, and today EM gauge uses an track gauge, which is closer to accurate but not fully to scale.