Looks like a couple of empty cars were pushed beyond the end of track, causing a derailment. This occurred on the yard tracks, so it was likely a low speed affair. CN has recently made a number of changes to the tracks here.
Yesterday the port released its 2018 cruise schedule. You can read it here.
The 2018 cruise season in Halifax will get underway on April 22, 2018 with the arrival of Fram, a Hurtigruten vessel who was last here in 2010. 2018 includes 10 scheduled inaugural calls starting with the arrival of Norwegian Bliss, a Norwegian Cruise Line vessel, on April 30, 2018. The other 9 include Victory II (June 3), Carnival Horizon (May 21), Asuka 2 (May 22), Hebridean Sky (May 30) ,Adventure of the Seas (June 6), AIDAvita (June 17), Ocean Dream (July 10), Star Pride (Sept 5)and Norwegian Escape (Sept 21)
Other Notable visits include Three visits from Disney Magic on September 17, September 22 and October 2 but only One visit from Queen Mary 2 on October 5. October 9 is expected to be the busiest passenger day with over 11,000 cruise guests on five vessels