State operator Comboios de Portugal (CP) says it is to launch a cut-price €20 monthly ticket for almost the entire national railway system before the close of the year. The new “investment in the environment” pass will come with limits, however, according to a recent Portuguese government statement. These include mandatory reservations at least 24 hours in advance for inter-city trips and a limit of 2 reservations or trips per person per day. The pass will not be valid on high-speed Alfa Pendular trains or on the metro or light rail systems, according to plans seen this month by Lusa, Portugal…