<s>
SimSig	B-Application
is	O
a	O
mixed	O
donationware	B-License
and	O
commercial	O
Windows-based	O
train	B-General_Concept
simulator	I-General_Concept
of	O
modern	O
railway	O
signalling	O
systems	O
in	O
Great	O
Britain	O
,	O
from	O
the	O
point	O
of	O
view	O
of	O
a	O
railway	O
signaller	O
.	O
</s>
<s>
Users	O
have	O
also	O
had	O
success	O
running	O
SimSig	B-Application
on	O
Linux	B-Application
using	O
Wine	B-Application
.	O
</s>
<s>
The	O
program	O
was	O
written	O
in	O
Delphi	B-Language
6	I-Language
,	O
a	O
dialect	O
of	O
Object	B-Language
Pascal	I-Language
,	O
by	O
Geoff	O
Mayo	O
and	O
has	O
been	O
in	O
development	O
since	O
the	O
late	O
1990s	O
.	O
</s>
<s>
Railtrack	O
asked	O
for	O
a	O
"	O
professional	O
"	O
version	O
of	O
SimSig	B-Application
,	O
now	O
known	O
as	O
TREsim	O
,	O
which	O
is	O
currently	O
used	O
to	O
train	O
signallers	O
at	O
every	O
Network	O
Rail	O
IECC	O
and	O
several	O
panel	O
signal	O
boxes	O
around	O
Great	O
Britain	O
.	O
</s>
<s>
As	O
of	O
July	O
2013	O
,	O
a	O
new	O
method	O
of	O
installing	O
,	O
running	O
and	O
updating	O
compatible	O
simulations	O
,	O
the	O
SimSig	B-Application
Loader	O
,	O
was	O
introduced	O
.	O
</s>
<s>
The	O
SimSig	B-Application
loader	O
allows	O
for	O
the	O
opening	O
and	O
updating	O
of	O
most	O
recent	O
simulations	O
via	O
a	O
single	O
program	O
as	O
opposed	O
to	O
the	O
individual	O
.exe	O
files	O
of	O
previous	O
simulations	O
.	O
</s>
<s>
In	O
September	O
2018	O
,	O
support	O
for	O
using	O
operating	O
systems	O
prior	O
to	O
Windows	B-Application
7	O
to	O
find	O
updates	O
was	O
discontinued	O
.	O
</s>
<s>
SimSig	B-Application
is	O
referenced	O
in	O
the	O
2nd	O
edition	O
of	O
Railway	O
Operation	O
and	O
Control	O
by	O
Professor	O
Jörn	O
Pachl	O
of	O
University	O
of	O
Braunschweig	O
-	O
Institute	O
of	O
Technology	O
.	O
</s>
<s>
Doctor	O
Marcelo	O
Moretti	O
Fioroni	O
of	O
the	O
University	O
of	O
São	O
Paulo	O
,	O
in	O
a	O
paper	O
on	O
rail	O
simulations	O
and	O
their	O
applications	O
in	O
Brazil	O
,	O
cited	O
SimSig	B-Application
as	O
an	O
extremely	O
realistic	O
simulation	O
,	O
reproducing	O
real	O
scenarios	O
.	O
</s>
<s>
The	O
Rail	O
Safety	O
and	O
Standards	O
Board	O
recommends	O
the	O
use	O
of	O
simulation	O
software	O
as	O
a	O
classroom	O
aid	O
and	O
specifically	O
mentions	O
the	O
SimSig	B-Application
website	O
as	O
a	O
source	O
:	O
</s>
<s>
SimSig	B-Application
has	O
been	O
described	O
by	O
Alan	O
Marshall	O
of	O
the	O
North	O
London	O
Society	O
of	O
Model	O
Engineers	O
as	O
"	O
a	O
remarkable	O
and	O
complex	O
simulator	O
that	O
will	O
test	O
your	O
skills	O
and	O
it	O
demands	O
quite	O
a	O
bit	O
of	O
patience	O
to	O
learn	O
how	O
to	O
operate	O
a	O
modern	O
signal	O
box	O
successfully	O
.	O
</s>
<s>
In	O
2009	O
the	O
National	O
Model	O
Railroad	O
Association	O
convention	O
at	O
Fort	O
Wayne	O
hosted	O
workshops	O
demonstrating	O
the	O
use	O
of	O
SimSig	B-Application
for	O
model	O
rail	O
simulations	O
.	O
</s>
