The calculated distance (air line) between Sv. Trojica v Slov. Goricah and Trbovlje is approximately 49 miles respectively 79 kilometers.
By car or train, the actual journey to Trbovlje is certainly longer, as only the direct route (as the crow flies) between Sv. Trojica v Slov. Goricah and Trbovlje has been calculated here.
Air line (approximately)
79 kilometers
42 nautical miles