The LIS and TBS sleeper types are standard sleepers for trams or industrial railways with axle loads of up to 18 tonnes. They are manufactured as narrow-gauge sleepers at 1.8 m and standard-gauge at 2.2 m in length. In addition to adaptation for rail profile, rail inclination and rail fastening, the sleepers can be manufactured with raised rail seats, for example to provide more volume for the grass substrate in green track installations.