Saga Cryptic Challenge

[margarettom]

7d. Revolutionary assembly helping to support rail travel. ( - O - - - )
10a. Old Edinburgh coffin in which there's one early colonial. ( - - - I - T)
16d. Charges for bags. ( L - A - S)
17d. River, it's said, going into bay. ( - O - N)

Thanks in advance for any help, I'm completely stuck on these.

[Oldred]

16d loads

[ubasses]

17 Roan

[margarettom]

I can see why this fits bags but not charges Oldred.

[dannyk13]

To charge a glass or a weapon is to load it.

[Oldred]

http://www.thefreedictionary.com/load

definition 5

[bibblebub]

10a: OIKIST = early colonial

old = O, edinburgh coffin = KIST, one = I

[dannyk13]

When did you morph into David McCallum Bibble?

[bibblebub]

yesterday but a new regeneration is not far away

[dannyk13]

:-)

[margarettom]

Thanks for all your help so far. 7d is now ( - O - I - ). Any ideas?

[ubasses]

bogie fits the helping to support rail travel but at the moment can't see how it fits rest of clue.

[Oldred]

bogie - assembly of wheels (which revolve)

[ubasses]

Of course, I was looking far too deeply. Playing about with parts of the word backwards (revolutionary) and anagrams (assembly).
Can't always see what is in front of your eyes!!!

[margarettom]

Thanks for all your help. I expect to back next month!!