so frequent and caused such considerable disruption to the service that a campaigning group, the Peace Train Organisation was formed in 1989. Since the Northern Ireland peace process however, such disruption has diminished. Renewed investment in recent years has seen the line upgraded to continuously welded track capable of running along the southern part of the route, as part of Iarnród Éireann's rail network upgrades. The Northern Ireland section of the line was also upgraded to 90 mph running on many sections of the line. Journey times vary between 2 hours 5 minutes (with four intermediate stops) and 2 hours 20 minutes (with six intermediate stops), with an average speed of respectively. The Railway Preservation Society of Ireland runs a steam Enterprise in the summer months to exchange its Dublin-based engine with its Whitehead-based engine. Autumn 2009 disruption On Friday 21 August 2009 of the Broadmeadow estuary viaduct, north of Malahide, collapsed, causing serious disruptions to Enterprise services. During the disruption the Enterprise operated between Belfast Central and Drogheda, with buses connecting Drogheda with Dublin Connolly. The line reopened on Monday 16 November with full services resumed. Mid-life refurbishment The Enterprise underwent a face-lift during 2009, with the carriages being resprayed in silver with green livery, some of which could be seen at Translink's York Road Maintenance Depot. In 2014, a mid-life refurbishment programme was announced for the Enterprise service. Rotating refurbishment involved substituting non-Enterprise trainsets on an individual basis which began in November 2014 with 5-car IE 22000 Class Trains Numbered 22036-22039 working the 07:35,10:35,13:20,16:05,19:00 and 21:35 (retimed 21:15 in June 2015) with a return to service of the first revamped coaches in November 2015. Refurbishment provided new mechanical running gear, in coach electronics and modernised interiors. The first refurbished set, consisting of DVT 9002 and Locomotive 206, operated a trial service from York Road Depot in Belfast to Dublin Connolly and back, on Thursday 15 October 2015 departing York Road at 10:27 and departing Dublin at 13:05. The same set operated its first official passenger service after its refurbishment on Monday 16 November 2015 working the 08:00 Belfast Central (Now Lanyon Place) To Dublin Connolly. The first set: 9002 Entered Service on Monday 16 November 2015, 9001 then entered service on 5 February 2016, working the 18:05 Belfast Central to Dublin Connolly, 9003 entered service on 1 April 2016 working the 08:00 Belfast to Dublin, And 9004 entered