Interesting to note that in 1891 Station Road, (ex Ford Lane), was maintained by the L&NWR and that the Northampton & Banbury Junction Railway Co. to contribute £10 per annum towards the cost of maintenance.
Actually the site of the SMJ cottages is well off the plan to the top right. It's a bit confusing as north is at the bottom of the plan, not the top. So the LNW main line runs across the top (London to the left), with its bridge over the canal just off picture to the left.
The wagon repair yard is tucked in between the up sidings and canal with the up side of Blisworth LNW station just visible at the top of the plan.
Difficult to comment on the date as there is little detail to go on, but the attached plan found in the National Archives at Kew provides an interesting comparison - although not dated the file contained items stated to be 1853 to 1893. Note the "third class platform" sited roughly where the exchange sidings between LNW and SMJ would appear later, so obviously before 1866 when the NBJR opened.
A most interesting map which I think may be earlier than stated. The stations were built by Richard Dunkley in 1845, as was his residence 'The Loundes', south of the Hotel, in 1846. The Blisworth Hotel was built by Dunkley in 1847, and owned by Thomas Shaw. Both Dunkley and Shaw laid out the Gardens in 1847, in exactly the same area as the reservoir, the land being purchased by the Duke of Grafton. The Duke, had also purchased land for the new 'first class station' to be built as stated in a letter written by his solicitor Thomas Howes, in April 1842. It is interesting to note that the other features on the map, the goods sheds, pumping house and tanks appear to be in the same position as built. If the railway company were obtaining water from the canal, as indicated by the position of the pumping house, then why was a reservoir needed? What do you think?
The "proposed" reservoir was never proceeded with but the road did get constructed - although perhaps on a slightly different alignment ?
I wonder if the reason for the reservoir was just to provide an improved head of water for the canal - feeders of that type were often located near to canals, and the pipe shown on the plan does go down to the existing ponds close to the LNWR water tower. So it might not have been intended for railway use at all.
One other angle might be that the NBJR asked the LNWR for use of their loco water crane in 1868, when they had just started using a "larger locomotive" and their own supply was found to be insufficient. The LNWR had to refuse as they were not allowed to re-sell water extracted from the canal under the terms of their agreement with the canal company.
Maybe connected with that?
There is no hint of the branch to Northampton and Peterborough, (Royal Assent 1843, opened 1845) which suggests a date earlier than 1853 for the creation of the plan. This may even have been drawn in preparation of the new works, and filed later.
Difficult one. Blisworths second station was built in this position at some date after the line to Northampton was opened in 1845- so the fact that the station is shown on this plan suggests a date post 1845. There does not appear to be a definitive date for the new station - in his bible of station openings etc M E Quick merely states by 1853. A plan in the Northampton Record Office showing sites of both old and new stations is just dated circa 1845 so also does not help much.
However, although the Northampton line is not shown on this plan, neither is anything else north of the main line - so I suspect that the plan is just truncated and the Northampton branch is missing accordingly - for example I can't think that there was not an up line platform in existence, but one is not shown.
The house known as The Loundes was built by Dunkley in 1848 according to the Blisworth History website so that may also give a clue. Likewise the Blisworth Hotel seems to have been around since 1846-ish.