The Transport Ministry is targeting 1 January 2027 for a shared fare on Bangkok-area rail lines in the common ticket system: an entry fee of up to 17 baht and a total cap of 45 baht per trip, with no repeat entry fee when switching lines. The plan is still pending: 10 sub-regulations are approved in principle, the central revenue clearing house rules and the fare split with operators (MRTA, SRT, BMA) are still being negotiated, and connecting-trip rules are not final. For a Thai SME, this mainly matters if you rely on staff or customers commuting across several lines. Watch for the final announcement before changing any commuting allowance or delivery and staff-travel costs.