A Test TS12 Version 3.3 dark Brick tunnel with 2 single tracks to make it a double track. Please try this tunnel in TS12 from Version 3.3 to 3.6 and if having any issues with it, please post these issues in my TS12 Tunnel thread in the Freeware Forum. Also, if working OK in the TS12 3.3 to 3.6 Versions. Thank you. Find this tunnel in your Scenery/Spline Tab in Surveyor.