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Record trump support; Partnership agreement

Playing a team game on BBO, partner opened a precision 1D which may be as few as two.  I may have had the biggest raise in the history of the game.  My diamond holding was AKQT7652. Can anyone top it? Now, I know Guinness is going to disqualify it because 1D was "artificial", but still...

Here is the entire deal:

West
AK6
AJ32
J9
8532
North
Q10874
K965
AQJ9
East
8
AKQ107652
K1074
South
J9532
Q1074
843
6
W
N
E
S
1
X
2
2
2NT
3
4
P
5
X
6
P
P
P
D
6 West
NS: 0 EW: 0

I described to my opponents that 2D was forcing one round, 4S was a splinter and 5C was "last train".  The opening lead was a small spade.  After the play was over I said to the table, "Well bid partner."

The other day I posted an arrogant and regrettable comment to the effect that, in an established partnership, the answer of "no agreement" to the question "what does the bid mean?" is "unacceptable." The gods must be watching (not to be confused with The Gods Must Be Crazy, one of my favorite movies with a rare, equally good, sequel.) In response to my compliment, one of my opponents wrote, "Annie described 4S as exclusion keycard blackwood and showed 1 keycard outside of spades." Ouch.

To add insult to injury, at the other table our opponents playing a standard system played 6D from the long diamond side and went down on a club ruff.

Who screwed up? Did we have an agreement? Here are the relevant sections lifted from our system notes.

"A splinter bid is an unusual jump in the bidding sequence which shows a singleton or void, has no other conventional meaning, and guarantees a fit for the last named suit by partner or in the suit in which we have trump suit agreement. If a new suit bid is forcing, a jump in a suit not previously shown by that partner is a splinter". (Yes, we play 1S-2D-2H-3S as a splinter in support of hearts!)

"Last train is used as a slam try without going past our trump suit at the 4 and 5 level and a grand slam try at the 6 level. In major suit auctions, 4M-1 is LT. In minor suit auctions, 5m-1 is LT."

"Exclusion with trump suit agreement. Jump above splinter or keycard bid (may be looking for a grand)."

Trump suit agreement is defined to include, "Auctions where a trump suit has been bid and raised."

"After single suit agreement in X, 4X+1 is Keycard Blackwood."

It is terrible when those damn lawyers write the system notes. The problem, of course, is the phrase "jump above splinter or keycard bid." 4H would have been keycard for diamonds. So, I think Annie got it right in that 4S was a jump above keycard. 

So, my question for you is, "What should our bids mean?" Should splinters take priority over exclusion?

4S should be a splinter, 5C should be last train
4S should be a splinter, 5C should be a control
4S should be exclusion blackwood in which case 5C showed 1
other, please describe

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