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Mr Evans, from Capel Dewi, Ceredigion, died after the crash and four others were seriously injured.
A further 11 people sustained injuries which required hospital treatment
On Tuesday, the RAIB issued an update on the investigation, adding that an automated system that helps train wheels grip tracks failed.
It said initial analysis indicated the 1J25 service from Shrewsbury to Aberystwyth was travelling between 15mph (24 km/h) and 24mph (39 km/h).
The 1S71service from Machynlleth to Shrewsbury was travelling at about 6mph (10 km/h) in the opposite direction.
The RAIB is continuing to analyse evidence relating to the collision speed, which it said remained an area of ongoing investigation.
Investigators said neither train derailed in the collision, although significant damage was caused to the leading vehicles of both trains.
The RAIB said it inspected the automatic sanding system, which automatically sprays sand via hoses when a wheel slide is detected during braking, in a bid to generate more friction.
It said the inspection of the system fitted to train 1J25 showed these hoses on the leading vehicle of the train “were blocked and apparently unable to discharge sand”.
Following Mr Evans’s death, British Transport Police (BTP) apologised after a close friend accused the force of failing to support his family.
They told PA news agency that Rachel Evans, Mr Evans’s wife, was “pretty much left to her own devices” after the crash.
The force issued a statement on 22 October saying “the deceased’s next of kin have been informed and his family are being supported by specialist officers”.
But a BTP officer actually visited the family on 23 October, PA reported.
BTP Supt Andrew Morgan said: “British Transport Police has apologised directly to the family of the deceased in relation to this statement and would like to apologise publicly for any additional suffering caused at this extremely difficult time.”
Transport for Wales and Network Rail said in a joint statement that it was “fundamental” to wait for the findings of the full report.
“As investigations are currently still ongoing, we’ll continue to work together with investigators to understand what happened and await the full conclusion and recommendations of the investigation.”
It added that they have carried out enhanced checks to the trains and the railway line to enable the reopening of the Cambrian line later this month.
