for nearly two decades, because all of the investment funds of AMCM (absorbed in 1988 by ATCM) were directed, throughout the 1980s, to the renewal of the fleet of trolleybuses. However, despite the receipt of 14 new Socimi trolleybuses (with Iveco chassis) in 1986, aging infrastructure and other issues made the use of trolleybuses sporadic by the 1990s, and on route 6-barrato it ceased entirely in 1993, leaving only route 7 trolleybus-operated. Revival In the mid-1990s, the outlook for the trolleybus system improved greatly, as a plan (known as the "Husler Plan", after its editor, the Swiss engineer Willi Husler) was prepared for the reform of the entire system. It provided for upgrades and extensions, and the opportunity was taken to rebuild the system to the most modern dictates, by reconstructing the overhead wire to make it suitable for higher speeds, and increasing the voltage from 600 V to 750 V. All of these extensive works necessitated the suspension of all trolleybus service from 30 October 1995 until May 2000. In addition to the infrastructure upgrade and expansion, fleet improvements were also approved. ATCM placed an order for 10 new articulated, low-floor trolleybuses with Modena-based Autodromo (with MAN chassis), and also made plans to refurbish the 14 Socimi vehicles, which needed modification to enable them to operate at the planned higher voltage. The Socimi trolleybuses were also fitted with auxiliary batteries permitting limited movement away from the overhead trolley wiring. The first Autodromo vehicle was delivered in spring 1999. In 2000, trolleybus service in Modena resumed after a nearly four-year suspension. The return of trolleybuses was ceremonially marked on 13 May 2000 by the operation of two decorated Autodromo trolleybuses through the city centre, without passengers, and the display of a preserved vintage Modena trolleybus, 1959-built Fiat/Cansa no. 33. The actual resumption of trolleybus service occurred two days later, on Monday, 15 May 2000, with the reopening of the renovated line 7. The new Autodromo articulated trolleybuses entered service on that date. The reopening of line 6 to trolleybuses followed on 13 November 2000, now operating Sant'Anna – city centre – Via Forlì, bringing into use new wiring along Corso Canal Grande (in place of Via Farini) in the city centre and extensions at both ends: from Sacca to Sant'Anna and from Viale Buon Pastore to Via Forlì. ATCM had opened a large new depot (garage) at Sant'Anna in 1996.