Mostyska is a city in Lviv Oblast

Lviv Oblast

Lviv Oblast is an oblast in western Ukraine. The administrative center of the oblast is the city of Lviv.-History:The oblast was created as part of the Ukrainian Soviet Socialist Republic on December 4, 1939...

 (province

Oblast

Oblast is a type of administrative division in Slavic countries, including some countries of the former Soviet Union. The word "oblast" is a loanword in English, but it is nevertheless often translated as "area", "zone", "province", or "region"...

) of Ukraine

Ukraine

Ukraine is a country in Eastern Europe. It has an area of 603,628 km², making it the second largest contiguous country on the European continent, after Russia...

. It is administrative center of the Mostyska Raion

Mostyska Raion

Mostyska Raion is a raion in Lviv Oblast in western Ukraine. Its administrative center is Mostyska. It has a population of 61 919.It was established in 1939.-External links:*...

. Population is 9,150 (2001). There is a break of gauge where the railway systems of the two countries meet. To speed up though traffic, a track gauge changing facility of the SUW 2000

SUW 2000

SUW 2000 is a type of variable gauge system that allows a train to travel across a railway break-of-gauge.The SUW 2000 design is manufactured by Polish company ZNTK Poznań for Polish State Railways...

 variable gauge axle system has been installed to allow fitted trains to pass through the break of gauge at walking pace.