Slough of Despond?As we were contemplating exploring the Slough Arm it started raining and blowing a gale so we decided to continue to Bull's Bridge where the Paddington Arm leaves the main line.  Through this horizontal precipitation we spied a plastic launch in difficulties.  On hailing the unfortunate sailors we were informed that their engine had stopped working so we towed them round to their marina mooring.
The almost dead straight five mile arm from Cowley Peachey to Slough was one of the last canals to be built in England .  In 1882 the railways were making an impact on transport economics throughout the land.  However it did survive for a while, taking bricks into London for the building boom and bringing back domestic waste.  This was not, I believe, the reason many locals refer to Slough as 
The Dump. This is more likely to have originated after WW1 when many of the military vehicles were brought to what is now the Trading Estate for disposal.
The town has been immortalised by John Betjeman (in the 1930s)  and, more recently, by Rickey Gervaise.  Which will be the more enduring depiction we will have to wait to see.
May I  remind you of John Betjeman's contribution?
  Come, friendly bombs, and fall on Slough
  It isn't fit for humans now,
  There isn't grass to graze a cow
    Swarm over, Death!
   
  Come, bombs, and blow to smithereens
  Those air-conditioned, bright canteens,
  Tinned fruit, tinned meat, tinned milk, tinned beans
    Tinned minds, tinned breath.
   
  Mess up the mess they call a town --
  A house for ninety-seven down
  And once a week for half-a-crown
    For twenty years,
   
  And get that man with double chin
  Who'll always cheat and always win,
  Who washes his repulsive skin
    In women's tears,
   
  And smash his desk of polished oak
  And smash his hands so used to stroke
  And stop his boring dirty joke
    And make him yell.
   
  But spare the bald young clerks who add
  The profits of the stinking cad;
  It's not their fault that they are mad,
    They've tasted Hell.
   
  It's not their fault they do not know
  The birdsong from the radio,
  It's not their fault they often go
    To Maidenhead
   
  And talk of sports and makes of cars
  In various bogus Tudor bars
  And daren't look up and see the stars
    But belch instead.
   
  In labour-saving homes, with care
  Their wives frizz out peroxide hair
  And dry it in synthetic air
    And paint their nails.
   
  Come, friendly bombs, and fall on Slough
  To get it ready for the plough.
  The cabbages are coming now;
    The earth exhales.
                               John Betjeman