It is *not* hard to believe. One only need to look at Burlington GO Station to forgo any amazement at this news

Auditor: "Hard to believe, isn't it?" Metrolinx gave more contracts to firm that installed bridge truss upside down https://t.co/1nhZIt0w5T

— Mike Crawley (@CBCQueensPark) November 30, 2016

Source: http://www.auditor.on.ca/en/content/annualreports/arreports/en15/4.00en15.pdf 
Lots more stuff relating to Metrolinx in the Auditor General's report... the Pickering Bridge section is shown below.

[Quote, bold highlights all mine*]
4.2.2 Metrolinx Awarded a Contractor Phase 2 of Pickering Bridge Project Even Though It Had Performed Extremely Poorly on Phase 1

The contractor for Phase 1 of the construction of a pedestrian bridge over Highway 401 in Pickering performed so poorly that Metrolinx staff had to take over performing many of its duties. Nevertheless, Metrolinx hired the same contractor for Phase 2 of the project because it was the lowest bidder. On Phase 2, the contractor caused significant damage to the bridge. Nevertheless, Metrolinx paid the contractor almost the full $8 million of their contract. We noted that, after performing poorly on both Phase 1 and Phase 2, Metrolinx still awarded this contractor another major project valued at $39 million.

The bridge in question is a landmark structure allowing pedestrians to cross 14 lanes of Highway 401 between the Pickering GO Station and the evolving Pickering City Centre development. Phase 1 of the project involved the construction of the bridge and stairwells; Phase 2 involved the installation of external cladding over the bridge. The bridge was to serve, according to the City of Pickering website, “as an iconic, luminous landmark, signifying where Pickering and Durham Region begin.”

Phase 1: Contractor Demonstrated Complete Lack of Experience in Building Bridges
Although building the bridge structure and stairwells would be fairly straightforward for an experienced contractor, the contractor awarded the job was performing poorly; as a result, Metrolinx staff had to take over and manage many of its responsibilities on this $19-million project. For example, the contractor had no experience in installing the bridge trusses (a bridge truss is the metal skeleton that is the most basic component of the bridge), something that a contractor constructing a bridge would be expected to know how to do. In fact, it installed one truss upside down. Seeing this, Metrolinx project staff stepped in to manage the truss installation even though this was clearly the contractor’s responsibility. They managed the truss supplier and related sub-trades, arranged the delivery of the trusses, shut down Highway 401 during installation, and managed other aspects of traffic flow. Metrolinx staff also went so far as to find a hauling company to move the trusses to the site: work that all should have been managed by the contractor. The contractor was still paid the full $19 million in payments.

Phase 2: Contractor Again Won Contract Despite Poor Performance then Damaged the Bridge 
Although Metrolinx was aware of this contractor’s lack of experience, its poor work ethic, and its unwillingness to improve performance, Metrolinx did not restrict it from bidding on Phase 2 of this project. Because this contractor’s bid was the lowest, Metrolinx awarded it the contract for the second phase of work.

The contractor’s performance was again poor—poor enough, in fact, that Metrolinx eventually terminated its contract. But not before the contractor caused significant damage to the bridge. By improperly welding some metal components, workers splattered metal over large areas of glass. A glass expert hired by Metrolinx later identified that 87% of the glass had been damaged, and recommended that it all be replaced. Metrolinx estimates it will cost about $1 million to fix the glass.

Metrolinx also discovered that the contractor built the stairwell incorrectly (in Phase 1). Because the stairwell had been built too wide, the cladding material would break if the contractor attempted to stretch it over the stairwells. The contractor did not fix the stairwell and, at the time of our audit, the problem still had not been solved. Metrolinx was working with an engineering firm to develop a cost-efficient solution to fix the stairwell problem at its own expense. Figure 5 shows the concept of the iconic bridge, and what is in place today because of the contractor’s mistake in constructing the stairwell.

Metrolinx terminated the contract with the contractor, even though the stairwell portion of the job had not been completed. Nevertheless, Metrolinx signed a settlement agreement, and paid the contractor 99% of the contract’s original value of $8 million.

We noted that after the contractor’s poor performance on both Phase 1 and Phase 2 of this project, Metrolinx awarded this contractor another project valued at $39 million. After that, Metrolinx chose not to award the contractor work on a few projects (for which the contractor provided the lowest bid) because it was not deemed qualified to perform the work based on past performance with Metrolinx. We discuss our concerns with this in Section 4.2.3 below.

[unquote]

*Mine being a concerned passenger who would like to stay anonymous who painfully read through the report and gave ThisCrazyTrain.com the highlights.