BUZZ-Stagecoach: JPM frets over slowing rail growth
** Stagecoach falls 5.3 pct as JPM downgrades to "neutral" from "overweight"
** Says UK rail industry showing signs of slowing revenues after 10 years of growth
** Cautious on Stagecoach's East Coast rail franchise as being among the most vulnerable to the trend
** 5 pct dividend preventing a further downgrade to "underweight", JPM says
** Second top faller on FTSE 250 index
** National Express (LSE: NEX.L - news) up 2.6 pct after JPM upgrades to "overweight" from "neutral"