I do not believe any reversals are necessary with the current plans for the rail link. The link would approach the site from the north then curve around to the southwest to run straight into the loading area alongside the canal. This render from the Peel website, linked above, shows a train on the curve.
View attachment 138556
The new planning application (linked in the OP of this thread) extends the loading area and headshunt further to the southwest than in the original plans, beyond the furthermost warehouses. The diagrams in the document do not show any provision for transferring containers to/from the canal, only between rail and road vehicles. Indeed the existing footpath between the site and the canal is retained.
As
@Wavertreelad pointed out in post #31 above, there is no longer any realistic prospect of containers being transhipped up the Ship Canal to a wharf at Port Salford, as envisaged in the 2009 proposals. Therefore, if the terminal is ever built, Peel must intend that it will compete with Trafford Park for rail traffic between the Southampton, London and Felixstowe ports and North West England. Hence no longer any need for an eastward connection to the Chat Moss line.
The two Trafford Park terminals are owned by Freightliner and DB Cargo, two of the largest operators in the intermodal rail market. However, capacity restrictions through the Castlefield Corridor might help Port Salford compete.
The planning application says that it will be at least five years before the improved road links between Port Salford and the M60 are completed (final phase of the Western Gateway Infrastructure Scheme). So I imagine that it would be at least that long before the rail terminal could be operational.