Thank you for more information about metro rail. In this case, there is no significant contribution from Communist party in terms of development in West Bengal.
However, their strategy in terms of development for people has been catastrophic. For instance, think, when commucnists government came in power in West Bengal, hundreds of jute industries were on boom and revenue from jute industry was very lucrative. Over the year this CPIM government has been so ruinous, hardly, anyone find any jute industry in West Bengal. This proves how bad their strategy is in terms of ecomical development.
Another point, Communist party do not know how to utilise the resources which are available. Instead, they are expert to misuse those resources. That's why West Bengal Government has got one of the highest debts from World Bank.
So I would say, considering any decision from such a party is a threat for whole nation.