Lumber futures rose to the highest in a month as some of Canada’s biggest producers reduce output and transportation snags disrupt shipments to customers.  March futures rose by the exchange limit of $45 Wednesday to $1,336 per $1,000 board feet in Chicago before paring gains. The surge comes as firms such as Canfor Corp. announce supply cuts in British Columbia, while port congestion and a lack of rail cars and trucks make it harder for Canadian companies to get timber to buyers.  “In Western Canada these transportation challenges are really unprecedented in both ...